Danny Orlis and the Mysterious Visitors — Bernard Palmer

Del, Doug, and DeeDee Davis and their cousins Phil and Marie head up to the Northwest Angle to spend part of the summer at their Uncle Carl's fishing camp. But there are so many strange things going on at the camp that the kids don't know which mystery to solve first. Police investigations, middle-of-the-night baseball games, bank robbers, and a kidnapping make this a high-action and inspiring read!